#pragma optimize ("O2")
#include <bits/stdc++.h>
using namespace std;
const int inf = 1e9 + 5, nmax = 5e5 + 2;
struct segm {
int l = inf, r = 0;
segm operator ++() {
r++;
l++;
return *this;
}
segm operator |(const segm& x) const { return segm{min(l, x.l), max(r, x.r)}; }
segm operator |=(const segm& x) { return (*this = *this | x); }
bool operator ==(const int& x) const { return l <= x && x <= r; }
};
int A[nmax * 2], B[nmax * 2];
segm atrA[nmax * 2], atrB[nmax * 2];
void decompose(int poz, int target, int type) {
if(poz == 0)
return;
int val = (type == 0? A[poz] : B[poz]), ch = (type == 0? 'A' : 'B');
if(A[poz - 1] <= val && atrA[poz - 1] == target)
decompose(poz - 1, target - 1, 0);
else
decompose(poz - 1, target, 1);
cout << (char)ch;
};
int main() {
int n;
cin >> n;
for(int i = 1; i <= 2 * n; i++) cin >> A[i];
for(int i = 1; i <= 2 * n; i++) cin >> B[i];
A[0] = B[0] = -1;
atrA[0] = segm{0, 0};
atrB[0] = segm{0, 0};
for(int i = 1; i <= 2 * n; i++) {
if(A[i] >= A[i - 1]) atrA[i] |= atrA[i - 1];
if(A[i] >= B[i - 1]) atrA[i] |= atrB[i - 1];
if(B[i] >= A[i - 1]) atrB[i] |= atrA[i - 1];
if(B[i] >= B[i - 1]) atrB[i] |= atrB[i - 1];
++atrA[i];
int mn = min(A[i - 1], B[i - 1]);
if(A[i] < mn)
A[i] = inf;
if(B[i] < mn)
B[i] = inf;
//cerr << A[i] << '\t' << B[i] << '\n' << atrA[i].l << ' ' << atrA[i].r << ", " << atrB[i].l << ' ' << atrB[i].r << '\n';
}
if(atrA[2 * n] == n)
decompose(2 * n, n - 1, 0);
else if(atrB[2 * n] == n)
decompose(2 * n, n, 1);
else
cout << "-1";
cout << '\n';
return 0;
}
Compilation message
building4.cpp:1: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
1 | #pragma optimize ("O2")
|
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
3 ms |
340 KB |
Output is correct |
| 6 |
Correct |
3 ms |
468 KB |
Output is correct |
| 7 |
Correct |
3 ms |
468 KB |
Output is correct |
| 8 |
Correct |
3 ms |
468 KB |
Output is correct |
| 9 |
Correct |
3 ms |
468 KB |
Output is correct |
| 10 |
Correct |
3 ms |
468 KB |
Output is correct |
| 11 |
Correct |
3 ms |
468 KB |
Output is correct |
| 12 |
Correct |
3 ms |
468 KB |
Output is correct |
| 13 |
Correct |
4 ms |
468 KB |
Output is correct |
| 14 |
Correct |
4 ms |
468 KB |
Output is correct |
| 15 |
Correct |
4 ms |
468 KB |
Output is correct |
| 16 |
Correct |
3 ms |
340 KB |
Output is correct |
| 17 |
Correct |
3 ms |
468 KB |
Output is correct |
| 18 |
Correct |
5 ms |
468 KB |
Output is correct |
| 19 |
Correct |
3 ms |
468 KB |
Output is correct |
| 20 |
Correct |
2 ms |
468 KB |
Output is correct |
| 21 |
Correct |
2 ms |
468 KB |
Output is correct |
| 22 |
Correct |
2 ms |
468 KB |
Output is correct |
| 23 |
Correct |
4 ms |
468 KB |
Output is correct |
| 24 |
Correct |
3 ms |
468 KB |
Output is correct |
| 25 |
Correct |
2 ms |
468 KB |
Output is correct |
| 26 |
Correct |
3 ms |
468 KB |
Output is correct |
| 27 |
Correct |
3 ms |
468 KB |
Output is correct |
| 28 |
Correct |
2 ms |
468 KB |
Output is correct |
| 29 |
Correct |
3 ms |
468 KB |
Output is correct |
| 30 |
Correct |
2 ms |
468 KB |
Output is correct |
| 31 |
Correct |
2 ms |
468 KB |
Output is correct |
| 32 |
Correct |
2 ms |
468 KB |
Output is correct |
| 33 |
Correct |
3 ms |
468 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
3 ms |
340 KB |
Output is correct |
| 6 |
Correct |
3 ms |
468 KB |
Output is correct |
| 7 |
Correct |
3 ms |
468 KB |
Output is correct |
| 8 |
Correct |
3 ms |
468 KB |
Output is correct |
| 9 |
Correct |
3 ms |
468 KB |
Output is correct |
| 10 |
Correct |
3 ms |
468 KB |
Output is correct |
| 11 |
Correct |
3 ms |
468 KB |
Output is correct |
| 12 |
Correct |
3 ms |
468 KB |
Output is correct |
| 13 |
Correct |
4 ms |
468 KB |
Output is correct |
| 14 |
Correct |
4 ms |
468 KB |
Output is correct |
| 15 |
Correct |
4 ms |
468 KB |
Output is correct |
| 16 |
Correct |
3 ms |
340 KB |
Output is correct |
| 17 |
Correct |
3 ms |
468 KB |
Output is correct |
| 18 |
Correct |
5 ms |
468 KB |
Output is correct |
| 19 |
Correct |
3 ms |
468 KB |
Output is correct |
| 20 |
Correct |
2 ms |
468 KB |
Output is correct |
| 21 |
Correct |
2 ms |
468 KB |
Output is correct |
| 22 |
Correct |
2 ms |
468 KB |
Output is correct |
| 23 |
Correct |
4 ms |
468 KB |
Output is correct |
| 24 |
Correct |
3 ms |
468 KB |
Output is correct |
| 25 |
Correct |
2 ms |
468 KB |
Output is correct |
| 26 |
Correct |
3 ms |
468 KB |
Output is correct |
| 27 |
Correct |
3 ms |
468 KB |
Output is correct |
| 28 |
Correct |
2 ms |
468 KB |
Output is correct |
| 29 |
Correct |
3 ms |
468 KB |
Output is correct |
| 30 |
Correct |
2 ms |
468 KB |
Output is correct |
| 31 |
Correct |
2 ms |
468 KB |
Output is correct |
| 32 |
Correct |
2 ms |
468 KB |
Output is correct |
| 33 |
Correct |
3 ms |
468 KB |
Output is correct |
| 34 |
Correct |
705 ms |
15648 KB |
Output is correct |
| 35 |
Correct |
743 ms |
52040 KB |
Output is correct |
| 36 |
Correct |
718 ms |
51108 KB |
Output is correct |
| 37 |
Correct |
1068 ms |
52412 KB |
Output is correct |
| 38 |
Correct |
758 ms |
52192 KB |
Output is correct |
| 39 |
Correct |
766 ms |
52448 KB |
Output is correct |
| 40 |
Correct |
844 ms |
55788 KB |
Output is correct |
| 41 |
Correct |
752 ms |
53328 KB |
Output is correct |
| 42 |
Correct |
767 ms |
54308 KB |
Output is correct |
| 43 |
Correct |
856 ms |
56064 KB |
Output is correct |
| 44 |
Correct |
837 ms |
56132 KB |
Output is correct |
| 45 |
Correct |
900 ms |
56052 KB |
Output is correct |
| 46 |
Correct |
908 ms |
56104 KB |
Output is correct |
| 47 |
Correct |
806 ms |
56128 KB |
Output is correct |
| 48 |
Correct |
823 ms |
55964 KB |
Output is correct |
| 49 |
Correct |
805 ms |
56004 KB |
Output is correct |
| 50 |
Correct |
845 ms |
55996 KB |
Output is correct |
| 51 |
Correct |
813 ms |
55960 KB |
Output is correct |
| 52 |
Correct |
510 ms |
56004 KB |
Output is correct |
| 53 |
Correct |
458 ms |
56056 KB |
Output is correct |
| 54 |
Correct |
487 ms |
56072 KB |
Output is correct |
| 55 |
Correct |
467 ms |
56012 KB |
Output is correct |
| 56 |
Correct |
855 ms |
56036 KB |
Output is correct |
| 57 |
Correct |
692 ms |
55760 KB |
Output is correct |
| 58 |
Correct |
845 ms |
56008 KB |
Output is correct |
| 59 |
Correct |
643 ms |
56064 KB |
Output is correct |
| 60 |
Correct |
623 ms |
52648 KB |
Output is correct |
| 61 |
Correct |
683 ms |
56116 KB |
Output is correct |
| 62 |
Correct |
724 ms |
55236 KB |
Output is correct |
| 63 |
Correct |
675 ms |
56032 KB |
Output is correct |
| 64 |
Correct |
641 ms |
54172 KB |
Output is correct |
| 65 |
Correct |
658 ms |
56012 KB |
Output is correct |
